Fastener



J. BERGE FASTENER Nov. 15, 1932.

Filed June 20, 1930 mmvron- M M, a

ATTORNEYS.

Patented Nov. 15, 1932 I UNITED STATES PATENT OFFICE JOSEPH BERGE, OF MONTCLAIR, NEW JERSEY FASTENER Application filed June 20, 1930. Serial No. 462,451.

.This invention relates to fasteners, and the invention, before and after it has been more particularly to those fasteners requirdriven home; ing means for preventing their loosening, Fig. 8 shows an embodiment having a pluhaving in mind machine screws, wood screws, rality of slots and consequent teeth or lips, 5 bolts and nuts. and p 55 One object of my invention is to provide Fig. 9 shows a headless type set screw emas an integral part of the head of a fastener, bodying the invention. a spur that will slip over the surface adjacent In the drawing, the numeral 1 illustrates the face of the fastener as the latter is tightthe biting tooth or spur that has been disened, but which will tend to engage the surplaced away from the contact surface or 60 face when the fastener is reversed. Plane Th manner of cutting this Slot iS Another object of my invention is to elimiimmaterial, but I find at present the most nate lock washers,-separate units generally onomical method is to saw the slots 3 at the inserted under the head of fasteners of this Same time, that is, in the same setting as made type. for the screw driver slots 4 which are sawed Another object of my invention is to speed In rapid automatic machines. The depth of up the assembly of devices requiring fastenthe Slot 3 depends on the type of head but let ers so safeguarded, it being apparent that a 1t flice o s y a g eater depth g ves spring fastener with the-locking spur as a part can to the tooth so that it functions as its own he handl d ith greater ease th h spring 1nsur1ng contact, should the fastener .companied by a separate lock washer. Shake 1 8 OI retch. p

Another object is to reduce the cost of man- I to v id weakenmg, the nut (Figufacture of articles requiring fasteners of p bly h s the bo tom of the Slot 3 this type. out almost to the thread diameter on the bot- In accordance with the present invention, tom Side 2 d S tilted that it does not P n 75 the head of the fastener is provided with a tram the. dlametel' 0n the top This may slot preferably in its side deep enough and at a be carried out in h embodiments sh wn an angle so as to permit deforming or dis- 111 g a 3-- In Fig. 5 the slot 3 has placing the acute an led portion so th t it also been shown at one side of the center line feather edge projects beyond the plane of 6 intersecting the screw driver slotat contact with the surface against which the angles I Fig- 9 I h W the Slot out direc 1 head butts. 1y into the thread of a headless set screw and A better understanding of the invention the lip is made from. the thread portion itmay be had from the following description l While I how all Of hese f righ 5 together with the accompanying drawing, h pp ion, they may be as readlly wh i made the opposite hand for left hand threads.

Fig. 1 is a perspective of an ordinary fillish operatlqn of the mventlon y be ter head screw of a conventional cylindrical readlly aseertamed by reference to 6 shape showing the regular screw driver slot and Shows fastener or Screw q r which has been. partly screwed into tho ele- 2513235533 Projector after slovtmg the ment 8. The bearing surface 2 of the screw has as yet not come into contact with the sur- F 1g. 2 shows a round head or button head Screw likewise provided with the spur; face 7 It maybe noted that in this positlon --th t'ltd 'blbl Figs. 3 and 4 shows a hexagonal head bolt 5:? g en apprecla' y e ow and nut respectively incorporating the m- Fig 7 shows-the fastener Screwed home venfiloni into the element 8, the surfaces 2 and 7 of the 5 Shows & fiat head co n k yp fasteners and the element'8 respectively be- Y head also Provlded Wlth the P ing tightly wedged together. It is to be 50 Figs. 6 and 7 show a screw incorporating noted that the slot 5 inclines upwardlyin th direction of tightening the screw, in consequence of which the protrusion 1 has little or no effect in preventing the fastener from being tightened. However, if an attempt is made to loosen the fastener, the protrusion 1 digs into the surface 7, thereby preventing relative movement between the various surfaces.

It is clear that if the fastener is softer than the surface 7 into which the tooth 1 is expected to dig, the tooth will simply return to its original position without functioning; To prevent this I provide hard material or harden the entire fastener, head and all, so that the fastener will be harder than the surface with which it will have contact. I may even harden the head alone but as this would prove more costly, I prefer to harden the entire fastener. This may be accomplished by any of the well known methods such as carbonizing, case hardening, the cyanide of potassium method, or by the use of oil or water quench tempering, or any other method.

It is to be understood that the embodiments disclosed herein are merely by way of illustration, and that the invention may be applied to numerous fastening elements, all of which are to be considered within the purview of this invention.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A fastener of the type adapted to bear against a surface in service. having a slot of a substantially triangular configuration bounded on one side by a sharp pointed protrusion adapted to engage said surface and prevent.

relative movement between said fastener and said surface in the direction of loosening said fastener.

2. A threaded fastener having on its depth-limiting surface a sharp protrusion adapted to dig into its adjacent bearing surface when turned in one direction, the said protrusion tapering to a point from the base of a slot cut in said fastener.

3. A fastener of the type adapted to bear against a surface in service, having a plurality of hardened protrusions preventing relative movement between said fastener and said surface in the, direction of loosening said fastener, the said protrusions each tapering to a point from the base of slots cut in said fastener.

4. A screw fastener of the type adapted to bear against a surface in service, a slot of substantially triangular configuration in said fastener inclined upwardly from its bearing face in the direction of tightening said screw,

of said fastener and slanting upwardly in the direction of tightening said fastener.

7. A fastener of the type adapted to bear against a surface in service, having a sharp pointed protrusion formed by slotting said fastener along a fraction only of its bearing surface.

8. A fastener of the type adapted to bear against a surface in service, having a pointed protrusion of decreasing triangular cross section, said point being adapted to prevent relative rotational movement between said fastener and said surface in one direction.

9. A threaded fastener having a head portion equipped with a bearing surface and a means for preventing relative rotation between said bearing surface and the surface with which it is in contact in one direction, said means being formed by slotting the head portion of said fastener to form a protrusion tapering from the base of said slot to a point. a

10. A fastener of the type adapted to bear against a surface in service, having means for preventing relative rotation in one direction between said fastener and said surface, said means being adapted to project into said surface, and formed by slottin said fastener to form a protrusion tapering to a point from the base of said slot.

In testimony whereof I aiiix my signature.

JOSEPH BERGE. 

